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Viruses, Earth's most abundant life, are crucial for evolution and biogeochemical cycles. Their interactions with cells drive life's diversity and adaptation, impacting astrobiology and our understanding of life in the cosmos.

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Area of Science:

  • Astrobiology and Virology
  • Evolutionary Biology
  • Microbial Ecology

Background:

  • Viruses are Earth's most abundant biological entities, yet often overlooked in astrobiology.
  • Viral diversity is immense, encompassing host interactions, genetic replication strategies, and gene content.
  • RNA viruses, in particular, exhibit vast sequence variability within populations.

Purpose of the Study:

  • To highlight the underappreciated role of viruses in astrobiology.
  • To emphasize the significant evolutionary and ecological impact of viruses on cellular life.
  • To advocate for the inclusion of viruses in models of life, both terrestrial and extraterrestrial.

Main Methods:

  • Review of viral diversity and ecological roles.
  • Analysis of viral impact on host evolution and adaptation.
  • Consideration of viral contributions to biogeochemical cycles.

Main Results:

  • Viruses act as powerful selective pressures, accelerating cellular defense evolution.
  • Viral genetic exchange can provide hosts with adaptive advantages for new environments.
  • Viruses play a critical role in planetary biogeochemical cycles, recycling essential matter.

Conclusions:

  • Viral-cellular interactions are fundamental to the structure of the "tree of life".
  • Viruses are essential for understanding life on Earth and the potential for life elsewhere in the cosmos.
  • Viruses must be integrated into astrobiological research and definitions of life.